參數(shù)資料
型號(hào): LTC2249CUH#PBF
廠商: Linear Technology
文件頁(yè)數(shù): 6/24頁(yè)
文件大?。?/td> 0K
描述: IC ADC 14BIT 80MSPS LP 32-QFN
標(biāo)準(zhǔn)包裝: 73
位數(shù): 14
采樣率(每秒): 80M
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 258mW
電壓電源: 單電源
工作溫度: 0°C ~ 70°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 32-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 32-QFN 裸露焊盤(pán)(5x5)
包裝: 管件
輸入數(shù)目和類(lèi)型: 1 個(gè)單端,雙極; 1 個(gè)差分,雙極
LTC2249
14
2249fa
Figure 5 shows a single-ended input circuit. The imped-
ance seen by the analog inputs should be matched. This
circuit is not recommended if low distortion is required.
The 25
resistorsand12pFcapacitorontheanaloginputs
serve two purposes: isolating the drive circuitry from the
sample-and-hold charging glitches and limiting the
wideband noise at the converter input.
For input frequencies above 70MHz, the input circuits of
Figure 6, 7 and 8 are recommended. The balun trans-
former gives better high frequency response than a flux
coupled center tapped transformer. The coupling capaci-
tors allow the analog inputs to be DC biased at 1.5V. In
APPLICATIO S I FOR ATIO
WU
UU
Figure 8, the series inductors are impedance matching
elements that maximize the ADC bandwidth.
Reference Operation
Figure 9 shows the LTC2249 reference circuitry consisting
of a 1.5V bandgap reference, a difference amplifier and
switching and control circuit. The internal voltage refer-
ence can be configured for two pin selectable input ranges
of 2V (
±1Vdifferential)or1V(±0.5Vdifferential).Tyingthe
SENSE pin to VDD selects the 2V range; tying the SENSE
pin to VCM selects the 1V range.
Figure 5. Single-Ended Drive
25
0.1
F
ANALOG
INPUT
VCM
AIN
+
AIN
1k
12pF
2249 F05
2.2
F
1k
25
0.1
F
LTC2249
Figure 6. Recommended Front End Circuit for
Input Frequencies Between 70MHz and 170MHz
25
25
12
12
0.1
F
AIN
+
AIN
8pF
2.2
F
VCM
LTC2249
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
2249 F06
Figure 8. Recommended Front End Circuit for
Input Frequencies Above 300MHz
25
25
0.1
F
AIN
+
AIN
2.2
F
VCM
LTC2249
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
2249 F07
25
25
0.1
F
AIN
+
AIN
2.2
F
VCM
LTC2249
ANALOG
INPUT
0.1
F
0.1
F
T1
T1 = MA/COM, ETC 1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
2249 F08
6.8nH
Figure 7. Recommended Front End Circuit for
Input Frequencies Between 170MHz and 300MHz
VCM
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO VCM FOR 1V RANGE;
RANGE = 2 VSENSE FOR
0.5V < VSENSE < 1V
1.5V
REFL
2.2
F
2.2
F
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1
F
2249 F09
LTC2249
4
DIFF AMP
1
F
1
F
INTERNAL ADC
LOW REFERENCE
1.5V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
Figure 9. Equivalent Reference Circuit
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